微量铜的示波极谱测定

1 引言用极谱催化波方法测定铜的工作已有报道。本文研究了铜—乙二胺—十二烷基苯磺酸钠体系,在单扫描示波极谱仪上于-0.68V(vs.SCE)处产生一个灵敏的二次导数示波极谱电流峰。检测限为2.5×10~(-8)mol/L,线性范围为3.7×10~(-8)～2.5×10~(-6)mol/L。用本法测定纯铝、水样及人     

微分吸附计时电位法测定矿石中微量铟

提出了一种测定微量铟的微分吸附计时电位法。以悬汞电极为工作电极 ,在 0.0 1mol/LHAc -NaAc,5× 10 - 7mol/L芦丁底液中 ,测定铟的线性范围为 1× 10 - 1 0 ～ 1× 10 - 7mol/L ,检出限为 5× 10 - 1 1 mol/L。探讨了影响方法灵敏度的主要因素 ,研究了电极过程。本法用于矿石中微量铟的测定 ,得到满意的结果     

镍-酸性铬蓝K络合吸附波的研究

在乙酸-乙酸钠(pH5.8)介质中,镍与酸性铬蓝K在-0.67V(VS、SCE)处有一灵敏的络合吸附波。镍的检测限为6.8×10-10mol/L,线性范围为1.36×10-8～2.73×10-6mol/L,可用于水样中微量镍的测定。对络合物的组成,极谱波的性质也进行了研究。     

镉-新亚铜灵极谱络合物吸附波的研究

在pH5.6的0.08mol/L邻苯二甲酸氢钾—0.0024％新亚铜灵—0.2mol/LNaNO_2溶液中,镉在单扫描示波极谱上有一个良好的络合物吸附波,Ep为-0.65V(vs.SCE)。导数蜂高与镉浓度在8×10~9～1.6×10~6g/ml的范围内呈线性关系。本法已用于测定样品中微量镉。     

催化极谱法测定钢中痕量钒

在 pH4.0的苯二甲酸氢钾介质中 ,有KBrO3存在的情况下 ,V 与邻苯二酚紫 (CV )生成络合物 ,在 -0 83V(vs SCE)处出现一灵敏的极谱峰。峰电流与V 的浓度在 8× 10 - 8～ 2. 4× 10 - 6 mol/L范围内呈线性关系 ,检出限为 2×10 - 8mol/L。体系选择性好 ,灵敏度高 ,用于钢中痕量钒的测定 ,重复性好 ,结果满意。     

示波极谱法测定锌电解液中微量铅

湿法炼锌过程中 ,锌电解液中微量铅影响电解锌的质量[1 ] ,分析其中的铅含量 ,以便加以控制和调节 ,确保电解锌产品质量。铅的测定主要有EDTA滴定法[2 ] ,但只适于高含量铅的测定 ,以KCl为底液示波极谱法可测定 1× 1 0 - 3 mol/L铅含量[3] ,但尚少见示波极谱法测定锌电解液中微量铅的报道。本法以HCl-NaCl-抗坏血酸为底液 ,示波极谱法测定锌电解液中微量铅 ,操作简便、快速 ,分析结果满意。1　实验部分1 1　仪器和试剂JP 2型示波极谱仪 (成都仪器厂 ) ;三电极系统。铅标准溶液 :0 1mg/mL ,称取 0 1 60 g硝酸铅 ,用 1 0mL硝酸 ( 1 …     

二溴对甲基偶氮磺光度法测定铝合金中微量铅

研究了新显色剂二溴对甲基偶氮磺与铅的反应,建立了直接测定铝合金中微量铅的光度分析方法。在0.6mol/L硝酸介质中,铅与二溴对甲基偶氮磺形成1∶2蓝色络合物,最大吸收波长630nm,表观摩尔吸光系数为9.05×104。在25mL溶液中,铅含量在0～50μg符合比尔定律。用于铝合金标样中铅的测定,相对标准偏差RSD为1.85%～4.02%,结果与标准值吻合。本法可用于铝合金中微量铅的直接测定。     

磷酸钕共沉淀火焰原子吸收光谱法测定硫酸钴中痕量铅和铁

本法用磷酸钕 (NdPO4 )作为共沉淀捕集剂 ,分离富集CoSO4 溶液中痕量Pb2 + 和Fe3+ ,用火焰原子吸收光谱法(FAAS)测定。共沉淀受pH ,NdCl3和H3PO4 溶液用量的影响。结果显示 ,在pH 3 .0～ 4.0时 ,NdPO4 能够定量共沉淀CoSO4 溶液中Pb2 + 和Fe3+ ,对于 2 0mL样品溶液 ,铅和铁的检出限分别为 8. 72× 10 - 3mg/L和 2 .5 1× 10 - 2 mg/L ,铅的加标回收率为 10 1.6% ,铁为 10 1.2 % ,排     

镉—茜素紫络合物的极谱吸附波及其应用

用线性扫描示波极谱法研究了Cd 茜素紫络合物的伏安行为 ,发现在含有 0.1mol/LKCl,pH4.9的NH4 Cl缓冲溶液中Cd —茜素紫络合物产生一灵敏的极谱吸附波 ,其峰电位为 - 0 6 6V(vs SCE) ,峰电流与Cd 的浓度在 8.0× 10 -8～ 2.0× 10 -6mol/L的范围内呈线性关系 ,检出限为 5.0×10 -8mol/L。研究了电极反应机理 ,并用建立的方法成功地测定了金属铝中痕量镉     

纯铝和纯锡中痕量铜的示波极谱测定

纯金属中痕量元素的分析是当前分析化学研究的一个重要课题,要求分析方法具有较高的灵敏度和良好的选择性。极谱法测定铜的方法已有报导,但铜—2-巯基苯并噻唑体系尚未见报导。我们在实验中发现,在氨性底液中,铜—2-巯基苯并噻唑配合物在单扫极谱上有—灵敏的还原波。实验确定底液的适宜组成为:8×10~(-5)mol/L2-巯基苯并噻唑,0.80mol/I NH_3·H_2O,0.040mol/L NH_4Cl。在此条件下,该配合物波高与铜浓度在1×10~(-9)～2×10~(-7)g/ml范围内呈良好的线性关系。对3     

Acceleration of Electricity Reform Brings Benefit to Big Electricity Users,Aluminum Manufacturers Can Save Costs Up to Several Hundred Million

<正>Recently the National Commission of Development and Reform again assembled experts to solicit opinions,and discussed new electricity reform program.According to information disclosed by experts attending the meeting,in the future electricity reform will undergo top-down design,possibly a     

Qinghai's Aluminum Processing Capacity to Rise at the End of the Year

正Since the release of Implementation Opinions on Carrying out‘Guiding Opinions of the State Council on Resolving Serious Production Overcapacity Conflicts’,according to the actual situation of industry,Qinghai has focused on electrolytic aluminum,cement,ironsteel(including iron alloy and silicon carbide),     

Recent Trends in China's Copper Scrap Market-Part Ⅱ

<正>2.Tianjin Scrap Metal Market In Tianjin,we mainly visited Jinghai Ziy Town scrap market and Binhai New Area’some copper scrap enterprises and enterprise using copper scrap.In Ziya we felt the coppe scrap market was particularly deserted,mos copper scrap enterprises in the town wer closed,industry insiders said in 2012 the plac here was bustling with activity.According to     

Shanghai Clearing House to Roll out Renminbi-denominated Copper Clearing Operations in Free Trade Zone

正Clearing House Financial Markets Co.,Ltd.(Shanghai Clearing House)General Manager Xie Zhong told the media recently at the briefing of the international symposium of"Reform Deepening and Mechanism Innovation of the Post-crisis Kerb Market",Shanghai Clearing House will explore the feasibility of carrying out bond business in     

Development and Application of New Materials for Copper Processing in China

正After over 60 years of developmnt,a system for RD and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper     

China’s Mineral Exploration Market Downturn Causes Decline of Investment in Bauxite

<正>According to a survey report conducted recently by China Geological Survey Development Research Center,in the first half of 2014,China’s mineral exploration market continued to decline,with the investment in exploration of non-fuel minerals dropping by13.7%and drilling workload dropping by21.7%.According to statistical analysis of the Center,     

Fabricated Copper Production by Province or City in 2014

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Zinc Production by Province in 2014

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China's Aluminum Alloy Cable Market has Taken Shape

正Aluminum alloy cable is a mature product and technology that has been used for nearly fifty years in the U.S.Through six years’promotion,it has been widely recognized and accepted in the China market since 2013,which laid the foundation for the development of the aluminum alloy cable market.Aluminum alloy cable is widely applied in the fields of civil construction and industrial and mining enterprises,especially in real estate,steel and metallurgy.     

Qinghai to Build a 100 Billion Yuan Lithium Industry Base

正At 2014 China Qinghai Trade Fair for Green Development Investment,Qinghai EV Rally2014 was introduced for the first time.With electrical vehicles’eco-friendly features,Qinghai manifested its determination on green development.Introducing Qinghai EV Rally was just a signal.By leveraging its rich salt lake resources